body{
    margin: 0;
    padding: 0;
}
.main{
    width: 100vw;
    height: 100vh;
    background-color: #ffffff;
    box-sizing: border-box;
    overflow: hidden;
}

.score{
    position: fixed;
    left: 20px;
    top: 5px;
    font-size: 20px;
    font-weight: bold;
    color: blueviolet;
    z-index: 3;
}

#con{
    position: relative;
    top: -100%;
    width: 100%;
    height: 100%;
    
    border-collapse: collapse;
}

.row{
    height: 25%;
    width: 100%;
    box-sizing: border-box;
}

.cell{
    float: left;
    height: 100%;
    width: 25%;
    outline: 1px solid #ccc;
}

.black{
    background-color: #000000;
}

.shadow{
    position: fixed;
    left: 0;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, .3);
    
}

button{
    display: inline-block;

    padding: .5em 3em;

    background-image: linear-gradient(blueviolet, aqua);

    border: 1px solid rgba(0,0,0,.2);

    border-radius: .3em;

    box-shadow: 0 1px white inset;

    text-align: center;

    text-shadow: 0 1px 1px black;

    color:#ffffff;

    font-weight: bold;
    
}
